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iOS Swift Functions and Optionals Optionals What is an Optional?

Rahul Wadhavkar
Rahul Wadhavkar
1,080 Points
Posted by Rahul Wadhavkar
Rahul Wadhavkar
1,080 Points

hi..I don't get this challenge, can't paste. I don't understand the purpose of the code after the If let stmt..help pls?

search.swift 
func search(#name: String) -> String? {
    let names = ["Doc","Grumpy","Happy","Sleepy","Bashful","Sneezy","Dopey"]
    for n in names {
        if n == name {
            return n
        }
    }
    return "nil"

    if let x = search (name: "Snow White") {
    println("Name Found: \(x)")
    }




}

1 Answer

Chris Shaw
Chris Shaw
26,676 Points
Chris Shaw
Chris Shaw
26,676 Points

Hi Rahul,

You have a number of problems with your code, see the below.

  1. "nil" shouldn't be wrapped in quotes as it's a type, it should just be nil
  2. You have your IF statement inside your function, it should be after the closing curly brace
  3. The challenge asks you to use Doc for the name parameter, instead you have Snow White
  4. Finally you're printing Name Found: \(x) which isn't required, you only need to print the word Found.
func search(#name: String) -> String? {
    let names = ["Doc","Grumpy","Happy","Sleepy","Bashful","Sneezy","Dopey"]
    for n in names {
        if n == name {
            return n
        }
    }

    return nil
}

if let x = search (name: "Doc") {
  println("Found")
}

Happy coding!

Rahul Wadhavkar
Rahul Wadhavkar
1,080 Points
Rahul Wadhavkar
Rahul Wadhavkar
1,080 Points

Thanks Chris - I was confusing this with the next question. I got the answer...

Have one more question - with regards to the your point # 2 in the reply..the IF Let statement being inside the function. Was the issue the missing curly brace after return nil? also - I thought if its inside the function, the the function will not run after the return statement, we already have a return statement in 'return n'...so how is the function running to throw us back a a nil value? why is the function running the "return nil statement"...

sorry about the stupid questions, never done programning in my life, first time ever...just learning

Chris Shaw
Chris Shaw
26,676 Points
Chris Shaw
Chris Shaw
26,676 Points

in the reply..the IF Let statement being inside the function. Was the issue the missing curly brace after return nil? also - I thought if its inside the function, the the function will not run after the return statement, we already have a return statement in 'return n'...so how is the function running to throw us back a a nil value? why is the function running the "return nil statement"...

In your original code you have your IF statement embedded within your function instead of after the ending curly brace, if you take a look at your code then mine you can see this very clearly as the return statement is followed directly by a closing curly brace whereas your code is followed by the IF statement which wouldn't work.